如何验证csv读取数据-Spring Boot Java

Question

MY代码是csv文件并逐行读取并存储到数据库。 如何验证每行数据是否正确。  如果正确读取的所有数据，则仅存储数据库，否则不存储并返回“ csv文件中的正确数据，请检查”。

县名验证应为字符串/仅文本， 国家/地区代码验证应仅是数字，最多4个数字

这是我的代码，无需任何验证即可正常工作

@PostMapping(value = {"/upload-csv"})

public ResponseEntity<?> CreateCountrytBulk(@RequestParam("file") MultipartFile inputFile, @RequestParam("type") Integer type) {
        BufferedReader crunchifyBuffer = null;
            String workingDir = System.getProperty("user.dir") +"/csv/";
            if (!inputFile.isEmpty()) try {
                byte[] bytes = inputFile.getBytes();
                Path path = Paths.get(workingDir + inputFile.getOriginalFilename());
                Files.write(path, bytes);
                countryCodeMapRepository.deleteAll();
                CSVReader reader = null;

                try {
                    reader = new CSVReader(new   FileReader(workingDir+ inputFile.getOriginalFilename()));
                    String[] line;
                    while ((line = reader.readNext()) != null) {
                        String y = line[0];
                        String country_name=y.trim();
                        String x = line[1];
                        Integer country_id = Integer.valueOf(x);
                        CountryCodeMapEntity countryCodeMapEntity = new CountryCodeMapEntity();
                        if(!(country_name ==null)&&!(country_id ==null)) {
                            countryCodeMapEntity.setCountry_name(country_name);
                            countryCodeMapEntity.setCountry_id(country_id);
                            countryCodeMapEntity.setStatus(1);
                            countryCodeMapEntity.setCreatedBy(1);
                            countryCodeMapEntity.setCreatedOn(LocalDateTime.now());

                            countryCodeMapRepository.save(countryCodeMapEntity);
                        }else{
                            return ResponseEntity.ok(new ApiResponse(false, "County List some value missing", ""));

                        }
                    }
                }  catch (IOException e) {
                    e.printStackTrace();
                }
                return ResponseEntity.ok(new ApiResponse(true, "County List created successfully", ""));
            } catch (Exception e) {
                return ResponseEntity.ok(new ApiResponse(true, "County List created successfully", ""));
            }
            else {
                return ResponseEntity.ok(new ApiResponse(true, "County List created successfully", ""));
            }
        }